Title:
CONSTRUCTION-MACHINERY HYDRAULIC CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2020/031816
Kind Code:
A1
Abstract:
A construction-machinery hydraulic circuit according to the present invention includes: a first pump line that connects a discharge port of a pump to a pump port of a first directional switching valve; a second pump line that is branched from the first pump line and that is connected to a pump port of a second directional switching valve; and a priority valve that is provided in the second pump line. The priority valve is configured so as to fully open the second pump line when the differential pressure between a discharge pressure of the pump and a load pressure of a first actuator is greater than a setting value and so as to reduce the degree of opening of the second pump line as the differential pressure becomes less, when the differential pressure therebetween is less than the setting value.
Inventors:
AOKI SEIJI
TODE YOSHIYUKI
OHIRA MASAHIRO
NAKAJIMA HIDEKI
TODE YOSHIYUKI
OHIRA MASAHIRO
NAKAJIMA HIDEKI
Application Number:
PCT/JP2019/030113
Publication Date:
February 13, 2020
Filing Date:
August 01, 2019
Export Citation:
Assignee:
KAWASAKI HEAVY IND LTD (JP)
CATERPILLAR SARL (CH)
CATERPILLAR SARL (CH)
International Classes:
F15B11/16; E02F9/22; F15B11/05
Foreign References:
| JP2017190799A | 2017-10-19 | |||
| JPS58153829A | 1983-09-13 |
Attorney, Agent or Firm:
PATENT CORPORATE BODY ARCO PATENT OFFICE (JP)
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